We report on the fabrication and characterization of a tunable filtering effect, observed in a waveguide grating made of alternated strips of photocurable polymer and a mixture of azo-dye doped liquid crystal. The grating is sandwiched between two borosilicate glasses, one of which includes an ion-exchanged channel waveguide, which confines the optical signal to be filtered. We analyze the effects of a low power visible, pump light beam that hits the sample and temperature effects. Both effects are investigated experimentally. The application of the pump light allowing the filtered wavelength to be tuned over a 6.6 nm range, while a temperature variation of 4 degrees C, implies a tuning of 14 nm.

All-Optical and Thermal Tuning of a Bragg Grating Based on Photosensitive Composite Structures Containing Liquid Crystals / G., Gilardi; Asquini, Rita; D'Alessandro, Antonio; R., Beccherelli; DE SIO, Luciano; C., Umeton. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1542-1406. - STAMPA. - 558:1(2012), pp. 64-71. [10.1080/15421406.2011.653680]

All-Optical and Thermal Tuning of a Bragg Grating Based on Photosensitive Composite Structures Containing Liquid Crystals

ASQUINI, Rita;D'ALESSANDRO, Antonio;DE SIO, LUCIANO;
2012

Abstract

We report on the fabrication and characterization of a tunable filtering effect, observed in a waveguide grating made of alternated strips of photocurable polymer and a mixture of azo-dye doped liquid crystal. The grating is sandwiched between two borosilicate glasses, one of which includes an ion-exchanged channel waveguide, which confines the optical signal to be filtered. We analyze the effects of a low power visible, pump light beam that hits the sample and temperature effects. Both effects are investigated experimentally. The application of the pump light allowing the filtered wavelength to be tuned over a 6.6 nm range, while a temperature variation of 4 degrees C, implies a tuning of 14 nm.
2012
liquid crystals; optical waveguides; opto-optical effect
01 Pubblicazione su rivista::01a Articolo in rivista
All-Optical and Thermal Tuning of a Bragg Grating Based on Photosensitive Composite Structures Containing Liquid Crystals / G., Gilardi; Asquini, Rita; D'Alessandro, Antonio; R., Beccherelli; DE SIO, Luciano; C., Umeton. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1542-1406. - STAMPA. - 558:1(2012), pp. 64-71. [10.1080/15421406.2011.653680]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/443388
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